US20040258582A1 - Honeycomb filter - Google Patents

Honeycomb filter Download PDF

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Publication number
US20040258582A1
US20040258582A1 US10/500,969 US50096904A US2004258582A1 US 20040258582 A1 US20040258582 A1 US 20040258582A1 US 50096904 A US50096904 A US 50096904A US 2004258582 A1 US2004258582 A1 US 2004258582A1
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Prior art keywords
honeycomb
honeycomb filter
central part
axial direction
segment
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US10/500,969
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US7244284B2 (en
Inventor
Shinichi Miwa
Yukio Miyairi
Shigeharu Hashimoto
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NGK Insulators Ltd
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NGK Insulators Ltd
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Assigned to NGK INSULATORS, LTD. reassignment NGK INSULATORS, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HASHIMOTO, SHIGEHARU, MIWA, SHINICHI, MIYAIRI, YUKIO
Publication of US20040258582A1 publication Critical patent/US20040258582A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
    • B01D46/2429—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material of the honeycomb walls or cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
    • B01D46/24494—Thermal expansion coefficient, heat capacity or thermal conductivity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2455—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the whole honeycomb or segments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2459—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the plugs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/247—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2474—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the walls along the length of the honeycomb
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2478—Structures comprising honeycomb segments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2484—Cell density, area or aspect ratio
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2486—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure characterised by the shapes or configurations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2486—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure characterised by the shapes or configurations
    • B01D46/2488—Triangular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2486—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure characterised by the shapes or configurations
    • B01D46/249—Quadrangular e.g. square or diamond
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2486—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure characterised by the shapes or configurations
    • B01D46/2492—Hexagonal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2482—Thickness, height, width, length or diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2498—The honeycomb filter being defined by mathematical relationships
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/10—Exhaust treating devices having provisions not otherwise provided for for avoiding stress caused by expansions or contractions due to temperature variations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/18—Exhaust treating devices having provisions not otherwise provided for for improving rigidity, e.g. by wings, ribs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/48—Honeycomb supports characterised by their structural details characterised by the number of flow passages, e.g. cell density
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/30—Exhaust treatment

Definitions

  • the present invention relates to a honeycomb filter for trapping particulate matter contained in dust-containing fluid such as exhaust gas emitted from a diesel engine.
  • a honeycomb structure has heretofore been used as a filter for trapping particulate matter contained in a dust-containing fluid such as exhaust gas emitted from a diesel engine.
  • the rapid temperature change of exhaust gas and the local heating easily makes non-uniform the temperature distribution inside the honeycomb structure, which makes problems such as crack generation in the honeycomb structure and the like.
  • the honeycomb structure is used particularly as a filter for trapping particulate matter in exhaust gas emitted from a diesel engine, it is necessary to burn the fine carbon particles deposited on the filter to remove the particles and regenerate the filter. In that case, high temperatures are inevitably generated locally in the filter. As a result, a large thermal stress and cracks tend to be generated.
  • the thermal stress is generated because thermal expansion/deformation of each part of the honeycomb structure differs by the non-uniformity of the temperature distribution, in which the temperature of a central part becomes higher than that of a peripheral part, and the parts are mutually restrained and are not freely deformable.
  • the above-described problem is remarkable especially in a honeycomb filter of SiC. That is, through the honeycomb filter of SiC is superior in heat resistance, the filter disadvantageously has a coefficient of thermal expansion which is higher than that of a conventionally-known cordierite honeycomb filter, and is inferior to the conventional filter in a thermal shock resistance.
  • the present invention has been developed in consideration of the conventional problems and aims to provide a honeycomb filter in which a crack is not generated by thermal stress generated at a use time, especially at a regeneration time and which is superior in durability.
  • a honeycomb filter for trapping particulate matter contained in dust-containing fluid, the filter comprising a number of through-holes surrounded by partition walls and extending in an axial direction, the partition walls having filterability, predetermined through-hales being plugged at one end, remaining through-holes being plugged at the other end, wherein in a section of the honeycomb filter perpendicular to the axial direction, a heat capacity in a central part of the honeycomb filter is higher than that in a peripheral part of the honeycomb filter.
  • a honeycomb filter for trapping particulate matter contained in dust-containing fluid, the filter comprising a number of through-holes surrounded by partition walls and extending in an axial direction, the partition walls having filterability, predetermined through-hales being plugged at one end, remaining through-holes being plugged at the other end, wherein the honeycomb filter comprises an assembly of a plurality of honeycomb segments, and in a section of each honeycomb segment perpendicular to the axial direction, a heat capacity of a central part of the honeycomb filter is higher than that of a peripheral part of the honeycomb filter.
  • a heat capacity of the central part of the honeycomb filter or the central part of each honeycomb segment is set to be higher than that of a peripheral part are as follows:
  • a non-plugged through-hole end portion is plugged in the central part of the honeycomb filter or in the central part of the honeycomb segment in the end face of the honeycomb filter in the axial direction;
  • a thickness of a partition wall in the central part of the honeycomb filter or in the central part of the honeycomb segment in the section perpendicular to the axial direction is set to be larger than that of the partition wall in the peripheral part;
  • the thickness of the partition wall in the central part of the honeycomb segment is set to be 1.02 to 1.5 times that of the partition wall in the peripheral part of the honeycomb segment in the section of the honeycomb filter perpendicular to the axial direction;
  • the thickness of the partition wall is gradually reduced toward the peripheral part from the central part with respect to some or all of the partition walls of the honeycomb segment in the section of the honeycomb filter perpendicular to the axial direction;
  • a cell density in the central part of the honeycomb filter or in the central part of the honeycomb segment in the section perpendicular to the axial direction is set to be larger than that in the peripheral part of the filter or the segment;
  • a bonding material of the honeycomb segment positioned in the central part of the honeycomb filter in the section perpendicular to the axial direction is set to be thicker than that of the honeycomb segment positioned in the peripheral part;
  • a thermal conductivity of the honeycomb segment positioned in the central part of the honeycomb filter in the section perpendicular to the axial direction is set to be higher than that of the honeycomb segment positioned in the peripheral part;
  • the plugging is performed in the honeycomb filter such that a plugging depth is large in the central part of the honeycomb filter or in the central part of the honeycomb segment, and small in the peripheral part of the filter or the segment, so that the heat capacity of the central part of the honeycomb filter is larger than that of the peripheral part.
  • a sectional area of the central part of the honeycomb segment is set to preferably 40 to 90% of that of the whole honeycomb segment in the section of the honeycomb filter perpendicular to the axial direction.
  • a material for the honeycomb filter preferably contains one selected from the group consisting of SiC, Si 3 N 4 , alumina, mullite, aluminum titanate, zirconium phosphate, and lithium aluminum silicate as a main crystal phase, and especially SiC is preferable because its heat resistance is superior.
  • the sectional shape of the through-holes of the honeycomb filter is preferably any of a triangle, a tetragon, a hexagon and a corrugated shape from the standpoint of production.
  • the honeycomb segment preferably carries a catalyst because the filter not only traps the particulate matter but also has a function of purifying the exhaust gas or the like is provided, and the catalyst further preferably contains at least one of Pt, Pd, Rh, K, Li, and Na.
  • FIG. 1 is an explanatory view showing an end face of an embodiment of a honeycomb filter of the present invention.
  • FIG. 2 is an explanatory view showing an end face of another embodiment of a honeycomb filter of the present invention.
  • FIG. 3 is an explanatory view showing an end face of another embodiment of a honeycomb filter of the present invention.
  • FIG. 4 is an explanatory sectional view showing another embodiment of a honeycomb filter of the present invention.
  • FIG. 5 is an explanatory sectional view showing another embodiment of a honeycomb filter of the present invention.
  • FIG. 6 is an explanatory partially sectional view showing another embodiment of a honeycomb filter of the present invention.
  • FIG. 7 is an explanatory sectional view showing another embodiment of a honeycomb filter of the present invention.
  • FIGS. 8 are explanatory sectional views showing other embodiments of a honeycomb filter of the present invention
  • FIG. 8( a ) shows a case where only a central part of a honeycomb segment has a thick partition wall
  • FIG. 8( b ) shows a case where the partition wall of the honeycomb segment is formed in a thick cross shape
  • FIG. 9 is an explanatory sectional view showing another embodiment of a honeycomb filter of the present invention.
  • FIG. 10 is a graph showing temperature distribution on a honeycomb filter in regeneration.
  • a section of the filter perpendicular to the axial direction is formed in such a manner that a heat capacity of a central part of the honeycomb filter is higher than that of a peripheral part or that a heat capacity of a central part of a honeycomb segment is higher than that of a peripheral part of the honeycomb segment. Accordingly, during use, especially at a regeneration time, a temperature rise in the central part whose temperature tends to rise more easily than in the peripheral part is suppressed, and a temperature difference between the central part and the peripheral part can be reduced. Therefore, cracks can be inhibited from being generated even by thermal stress caused in the honeycomb filter, and the filter is remarkably superior in durability.
  • the present invention is a honeycomb filter for trapping particulate matter contained in a dust-containing fluid.
  • the filter has a number of through-holes surrounded by partition walls and extending in an axial direction, the partition walls of the through-holes have filterability, predetermined through-holes are plugged at one end portion, and the remaining through-holes are plugged at the other end portion.
  • a non-plugged through-hole end portion is plugged in the central part of the honeycomb filter or in the central part of the honeycomb segment in the end face of the honeycomb filter in the axial direction;
  • a thickness of a partition wall in the central part of the honeycomb filter or in the central part of the honeycomb segment in the section perpendicular to the axial direction is set to be larger than that of the partition wall in the peripheral part;
  • the thickness of the partition wall in the central part of the honeycomb segment is set to be 1.02 to 1.5 times that of the partition wall in the peripheral part of the honeycomb segment in the section of the honeycomb filter perpendicular to the axial direction;
  • the thickness of the partition wall is gradually reduced toward the peripheral part from the central part with respect to some or all of the partition walls of the honeycomb segment in the section of the honeycomb filter perpendicular to the axial direction;
  • a cell density in the central part of the honeycomb filter or in the central part of the honeycomb segment in the section perpendicular to the axial direction is set to be larger than that in the peripheral part of the filter or the segment;
  • a bonding material of the honeycomb segment positioned in the central part of the honeycomb filter in the section perpendicular to the axial direction is set to be thicker than that of the honeycomb segment positioned in the peripheral part;
  • a thermal conductivity of the honeycomb segment positioned in the central part of the honeycomb filter in the section perpendicular to the axial direction is set to be higher than that of the honeycomb segment positioned in the peripheral part;
  • the plugging is performed in the honeycomb filter such that a plugging depth is large in the central part of the honeycomb filter or in the central part of the honeycomb segment, and small in the peripheral part of the filter or the segment, so that the heat capacity of the central part of the honeycomb filter is larger than that of the peripheral part.
  • the honeycomb filter is constituted by a single body.
  • the honeycomb filter comprises a plurality of honeycomb segments, and the respective honeycomb segments are bonded via a bonding material to constitute the honeycomb filter.
  • the honeycomb filter is constituted by a single body, as the first embodiment, the end portions of the through-holes which are not usually plugged are plugged in the central part of the end face of the honeycomb filter in the axial direction.
  • the end portions of through-holes 12 are usually alternately plugged.
  • the end portions of the through-holes 12 which are not usually plugged are further plugged. Accordingly, the heat capacity of the central part 11 can be set to be larger than that of a peripheral part 13 .
  • the object to set the heat capacity of the central part 11 to be larger than that of the peripheral part 13 can be achieved also when a plugging depth is increased in the central part 11 among the plugged end portions of the through-holes 12 .
  • an area range of the central part is set to 20 to 90% of that of a sectional area of the honeycomb filter (or the honeycomb segment).
  • the region of the central part include a region surrounded by a shape analogous to a sectional shape of an outer peripheral surface centering on a center point on the section of the honeycomb filter (or the honeycomb segment), and a region surrounded by a circle centering on the center point.
  • the area range of the central part is preferably 40 to 90%, further preferably 50 to 90% of the sectional area of the honeycomb filter (or the honeycomb segment).
  • the thickness of the partition wall in the central part of the section of the honeycomb filter perpendicular to the axial direction is set to be larger than that of the partition wall in the peripheral part.
  • the thickness of a partition wall 14 a in the central part 11 is formed to be larger than that of a partition wall 14 b in the peripheral part 13 . Accordingly, the heat capacity of the central part 11 can be set to be higher than that of the peripheral part 13 . Furthermore, in this constitution, resistance at a time when the exhaust gas passes through the partition wall in the central part of the honeycomb filter increases as compared with that in the peripheral part. Therefore, the amount of exhaust gas flowing through the central part of the honeycomb filter drops, and an amount of deposited particulate matter is also decreased.
  • the amount of heat generated in the central part of the honeycomb filter at the regeneration time relatively drops as compared with the outer peripheral part, temperature distribution of the honeycomb filter in a sectional direction is uniformalized, and a problem that the honeycomb filter is cracked at the regeneration time is solved.
  • the heat capacity of the central part 11 can be set to be larger than that of the peripheral part 13 in the same manner as described above.
  • the honeycomb filter comprises a plurality of honeycomb segments and the respective honeycomb segments are bonded by the bonding material to constitute the honeycomb filter will be described.
  • the heat capacity of the filter central part can be set to be larger than that of the peripheral part by various embodiments as described below.
  • the heat capacity of the central part of each honeycomb segment can be set to be larger than that of the peripheral part.
  • honeycomb segments 15 are bonded to one another by a bonding material 20 only in the central part of the honeycomb filter 10 .
  • the thickness of the partition wall of a honeycomb segment 15 a positioned in the central part 11 is set to be larger than that of the partition wall of a honeycomb segment 15 b positioned in the peripheral part 13 in section of the honeycomb filter 10 perpendicular to the axial direction.
  • the amount of deposited particulate matter can be decreased. Therefore, the amount of heat generated in the central part of the honeycomb segment at the regeneration time relatively drops as compared with the outer peripheral part, and a problem that the honeycomb segment is cracked at the regeneration time is solved.
  • a bonding material 20 a for use in bonding the honeycomb segment 15 a positioned in the central part 11 is formed to be thicker than a bonding material 20 b for use in bonding the honeycomb segment 15 b positioned in the peripheral part 13 .
  • the thermal conductivity of the honeycomb segment positioned in the central part is set to be larger than that of the honeycomb segment positioned in the peripheral part in a preferable embodiment.
  • plugging portions 16 are formed such that the plugging depth is large in the central part and small in the peripheral part. Accordingly, the heat capacity of the central part of the honeycomb filter 10 becomes larger than that of the peripheral part. This may be said to be a preferable embodiment.
  • the heat capacity of the central part is set to be larger than that of the peripheral part as another preferable embodiment.
  • partition walls 14 c in the central part of the honeycomb segment 15 is formed to be thicker than partition walls 14 d in the peripheral part as another preferable embodiment.
  • partition walls 14 e are formed to be thick in a cross form in each honeycomb segment 15 as still another preferable embodiment.
  • the thickness of the partition wall in the central part of the honeycomb segment is preferably 1.02 to 1.5 times that of the partition wall in the peripheral part of the honeycomb segment.
  • a air flow resistance of the whole honeycomb filter tends to increase.
  • the thickness may be gradually increased toward the inside from a position of a contact 30 of an outer peripheral wall 18 .
  • the thickness of the partition wall 17 partitioning each through-hole 12 may be successively increased toward the inside from the outside.
  • “being gradually increased” means that an average thickness of the partition wall 17 which partitions the through-hole 12 positioned in a peripheral side is increased.
  • the thickness may be continuously changed as shown in FIG. 9, or the thickness may also be changed for each partition wall 17 which partitions one through-hole 12 .
  • the thickness of the partition wall of the honeycomb segment is in a range of preferably 50 to 2,000 ⁇ m.
  • the thickness of the partition wall is less than 50 ⁇ m, strength of the honeycomb segment becomes insufficient.
  • the thickness exceeds 2000 ⁇ m, effective geometric surface area (GSA) of the honeycomb segment drops, and a pressure loss increases when the gas flows.
  • the sectional area of the central part of the honeycomb segment is preferably 40 to 90%, further preferably 50 to 90% of that of the whole honeycomb segment in the section of the honeycomb filter perpendicular to the axial direction.
  • a sectional shape of the section of the honeycomb filter perpendicular to the through-hole in the present invention may be various shapes such as a circle, an ellipse, and a lace track shape.
  • honeycomb filter of the present invention an embodiment in which two or more honeycomb segments are combined/constituted may be employed.
  • a material for the filter preferably contains one selected from the group consisting of SiC, Si 3 N 4 , alumina, mullite, aluminum titanate, zirconium phosphate, and lithium aluminum silicate as a main crystal phase from standpoints of strength, thermal resistance or the like, and SiC having a high thermal conductivity is especially preferable in that heat is easily discharged.
  • the cell density of cells formed by the partition walls is preferably 6 to 2000 cells/square inch (0.9 to 311 cells/cm 2 ), further preferably 50 to 400 cells/square inch (7.8 to 62 cells/cm 2 ).
  • the strength and effective geometric surface area (GSA) of the honeycomb segment become insufficient.
  • the density exceeds 2000 cells/square inch (311 cells/cm 2 )
  • the pressure loss increases when the gas flows.
  • sectional shape of through-holes is preferably any of a triangle, a tetragon, a hexagon and a corrugated shape from the standpoint of production.
  • a ceramic fiber, ceramic powder, or cement having heat resistance is preferably used alone, or they are mixed for use. Furthermore, if necessary, an organic binder, an inorganic binder or the like may also be mixed and used.
  • the dust-containing fluid flows into the honeycomb filter via the through-holes whose end portions on one end face side are not plugged.
  • the fluid passes through porous partition walls having filterability, and enters the other through-holes that are not plugged on the side of the other end face of the honeycomb filter.
  • the particulate matter in the dust-containing fluid is trapped by the partition walls when the fluid passes through the partition walls, and the purified fluid from which the particulate matter has been removed is discharged from the other end face of the honeycomb filter.
  • the honeycomb filter of the present invention is loaded with a catalyst, for example, a metal having a catalytic activity when the present honeycomb filter is intended to use as a catalyst carrier for purifying exhaust gas emitted from a heat engine such as internal combustion engine or the like or from a burner such as boiler or the like, or for reforming liquid fuel or gaseous fuel.
  • a catalyst for example, a metal having a catalytic activity
  • Pt, Pd, Rh, K, Li and Na are mentioned, and it is preferred to load at least one kind of these on the honeycomb filter.
  • a raw material powder for the honeycomb segment As a raw material powder for the honeycomb segment, the above-described preferable materials such as a silicon carbide powder are used. To the powder, binders such as methyl cellulose and hydroxypropoxyl methylcellulose are added. Further, a surface-active agent and water are added to prepare clay having plasticity. The clay is extruded to form honeycomb segments as shown, for example, in FIGS. 4, 5, 8 ( a ), 8 ( b ), and 9 .
  • binders such as methyl cellulose and hydroxypropoxyl methylcellulose are added.
  • a surface-active agent and water are added to prepare clay having plasticity. The clay is extruded to form honeycomb segments as shown, for example, in FIGS. 4, 5, 8 ( a ), 8 ( b ), and 9 .
  • the outer peripheral surface of the honeycomb segment is coated with the bonding material having the same composition as that of the clay, and the honeycomb segments are bonded, assembled, and dried.
  • the obtained assembled dry body is heated/degreased, for example, in a nitrogen atmosphere, and subsequently heated in an inert atmosphere such as Ar atmosphere so that the honeycomb filter of the present invention can be obtained.
  • a plate formed by a bonding material in a predetermined thickness may be used, and a honeycomb segment may be bonded to another honeycomb segment by the plate and the bonding material.
  • the end face of the honeycomb filter can be plugged with a raw material similar to that of the honeycomb segment.
  • Catalyst may be loaded on the thus-produced honeycomb filter by a method ordinarily used by those skilled in the art, for example, by wash-coating a catalyst slurry on the honeycomb filter, and then conducting drying and firing.
  • Regeneration limit was evaluated using a honeycomb filter having material characteristics such as a porosity of 45%, an average pore diameter of 10 ⁇ m, and a thermal conductivity of 40 W/mK and comprising a honeycomb structure of SiC having a diameter of 5.66 inches and a length of 6 inches and having a plugging depth of 3 mm.
  • a predetermined amount of artificially produced soot was deposited on the honeycomb filter, and a high-temperature gas was introduced at 600° C., 2.3 Nm 3 /min to regenerate the filter (burn the soot). Thereafter, a limit soot amount in which any crack was not generated was set to a regeneration limit.
  • a dimension of nine segments in Examples 4 to 7, Comparative Examples 2, 4 was basically 58 mm, and an outer peripheral segment was worked in a predetermined outer dimension in accordance with a product outer shape.
  • the amount of deposited soot was 10 g/L, and a high-temperature gas having an O 2 concentration of 10% was introduced at 600° C., 0.7 Nm 3 /min to regenerate/burn the honeycomb filter.
  • the results of measurement of a temperature distribution at the regeneration time in this case are shown in FIG. 10.
  • r(m) denotes a length in a radial direction
  • X(m) denotes a length in an axial direction
  • lines shown in a graph are isothermal lines indicating a temperature distribution
  • numeric values indicate temperatures of the isothermal lines (unit:° C.).
  • Example 9 12/300 Central part additional 20 plugged 150 cells
  • Example 10 12/300 Wall thickness of central part 22 15 mil, radial direction 50% length region
  • Example 11 12/300 Central part 350 cpi, radial 16 direction 50% length region
  • Example 12 12/300 9 segments, bonding thickness 20 3 mm, segment central part in cross shape, 7 cells in width, 15/200 structure, cell thickness increase
  • Example 13 12/300 9 segments, central segment 18 14/200, bonding thickness 3 mm
  • the regeneration limit was evaluated with respect to honeycomb filters which were the same as those of Examples 1 to 8, Comparative Examples 1 to 4 except that cordierite was used as the material, cell structures with 12 mil/200 cpi, 12 mil/300 cpi were used, and the cell thickness of the honeycomb segment central part was increased to 15 mil.
  • the results are shown in Table 3.
  • SiC was used as a material
  • 12 mil/200 cpi, 12 mil/300 cpi were used as a cell structure
  • the cell thickness was increased in a predetermined area portion in the central part of a honeycomb segment as shown in FIG. 8( a ), and regeneration limits of Examples 19 to 25 were evaluated.
  • the results of the evaluation of a uniform thickness are shown in Comparative Examples 12, 13.
  • Example 10 thickness 1 mm Comparative 12/300 9 segments, uniform bonding 10 Example 11 thickness 1 mm
  • a honeycomb filter of the present invention during use, especially at a regeneration time, a temperature rise is suppressed in a central part of the honeycomb filter or a central part of each honeycomb segment whose temperature tends to rise as compared with a peripheral part.
  • a temperature difference between the central part and the peripheral part of honeycomb filter or between the central part and the peripheral part of each honeycomb segment is reduced, and a thermal stress generated in the honeycomb filter can be reduced.
  • any crack can be inhibited from being generated in the honeycomb filter, and the filter has a superior effect that durability is remarkably superior.

Abstract

A honeycomb filter of the present invention is a honeycomb filter 10 including a number of through-holes 12 surrounded by partition walls and extending through an axial direction, in which the partition walls have filterability, predetermined through-holes 12 are plugged at one end portion, and the remaining through-holes 12 are plugged at the other end portion to trap particulate matter contained in a dust-containing fluid. The honeycomb filter is characterized in that a heat capacity of a central part 11 is set to be larger than that of a peripheral part 13 in a section of the honeycomb filter 10 perpendicular to the axial direction. There is provided a honeycomb filter in which a crack is not generated by thermal stress during use, especially at a regeneration time and which is superior in durability.

Description

    TECHNICAL FIELD
  • The present invention relates to a honeycomb filter for trapping particulate matter contained in dust-containing fluid such as exhaust gas emitted from a diesel engine. [0001]
    • BACKGROUND ART
  • A honeycomb structure has heretofore been used as a filter for trapping particulate matter contained in a dust-containing fluid such as exhaust gas emitted from a diesel engine. [0002]
  • In the honeycomb structure used for such a purpose, the rapid temperature change of exhaust gas and the local heating easily makes non-uniform the temperature distribution inside the honeycomb structure, which makes problems such as crack generation in the honeycomb structure and the like. When the honeycomb structure is used particularly as a filter for trapping particulate matter in exhaust gas emitted from a diesel engine, it is necessary to burn the fine carbon particles deposited on the filter to remove the particles and regenerate the filter. In that case, high temperatures are inevitably generated locally in the filter. As a result, a large thermal stress and cracks tend to be generated. Here, the thermal stress is generated because thermal expansion/deformation of each part of the honeycomb structure differs by the non-uniformity of the temperature distribution, in which the temperature of a central part becomes higher than that of a peripheral part, and the parts are mutually restrained and are not freely deformable. [0003]
  • The above-described problem is remarkable especially in a honeycomb filter of SiC. That is, through the honeycomb filter of SiC is superior in heat resistance, the filter disadvantageously has a coefficient of thermal expansion which is higher than that of a conventionally-known cordierite honeycomb filter, and is inferior to the conventional filter in a thermal shock resistance. [0004]
  • To avoid this disadvantage, there has been known a measure of dividing structural parts into smaller segments to reduce the stress, and a proposal for applying this measure to the honeycomb structure for trapping particulates in the exhaust gas has been already described, for example, in JP-A-6-241017, JP-A-8-28246, JP-A-7-54643, and JP-A-8-28248. [0005]
  • However, since a thermal conductivity in a radial direction drops in the structure described in the above proposals, the thermal shock resistance is not much enhanced. Therefore, a stress reducing effect on the segment surface is insufficient, and the problem of crack generation cannot be completely solved. [0006]
  • The present invention has been developed in consideration of the conventional problems and aims to provide a honeycomb filter in which a crack is not generated by thermal stress generated at a use time, especially at a regeneration time and which is superior in durability. [0007]
    • DISCLOSURE OF THE PRESENT INVENTION
  • As the first aspect of the present invention, there is provided a honeycomb filter for trapping particulate matter contained in dust-containing fluid, the filter comprising a number of through-holes surrounded by partition walls and extending in an axial direction, the partition walls having filterability, predetermined through-hales being plugged at one end, remaining through-holes being plugged at the other end, wherein in a section of the honeycomb filter perpendicular to the axial direction, a heat capacity in a central part of the honeycomb filter is higher than that in a peripheral part of the honeycomb filter. [0008]
  • As the second aspect of the present invention, there is provided a honeycomb filter for trapping particulate matter contained in dust-containing fluid, the filter comprising a number of through-holes surrounded by partition walls and extending in an axial direction, the partition walls having filterability, predetermined through-hales being plugged at one end, remaining through-holes being plugged at the other end, wherein the honeycomb filter comprises an assembly of a plurality of honeycomb segments, and in a section of each honeycomb segment perpendicular to the axial direction, a heat capacity of a central part of the honeycomb filter is higher than that of a peripheral part of the honeycomb filter. [0009]
  • In the present invention, preferable embodiments in which a heat capacity of the central part of the honeycomb filter or the central part of each honeycomb segment is set to be higher than that of a peripheral part are as follows: [0010]
  • (1) a non-plugged through-hole end portion is plugged in the central part of the honeycomb filter or in the central part of the honeycomb segment in the end face of the honeycomb filter in the axial direction; [0011]
  • (2) a thickness of a partition wall in the central part of the honeycomb filter or in the central part of the honeycomb segment in the section perpendicular to the axial direction is set to be larger than that of the partition wall in the peripheral part; [0012]
  • (3) the thickness of the partition wall in the central part of the honeycomb segment is set to be 1.02 to 1.5 times that of the partition wall in the peripheral part of the honeycomb segment in the section of the honeycomb filter perpendicular to the axial direction; [0013]
  • (4) the thickness of the partition wall is gradually reduced toward the peripheral part from the central part with respect to some or all of the partition walls of the honeycomb segment in the section of the honeycomb filter perpendicular to the axial direction; [0014]
  • (5) a cell density in the central part of the honeycomb filter or in the central part of the honeycomb segment in the section perpendicular to the axial direction is set to be larger than that in the peripheral part of the filter or the segment; [0015]
  • (6) a bonding material of the honeycomb segment positioned in the central part of the honeycomb filter in the section perpendicular to the axial direction is set to be thicker than that of the honeycomb segment positioned in the peripheral part; [0016]
  • (7) a thermal conductivity of the honeycomb segment positioned in the central part of the honeycomb filter in the section perpendicular to the axial direction is set to be higher than that of the honeycomb segment positioned in the peripheral part; and [0017]
  • (8) the plugging is performed in the honeycomb filter such that a plugging depth is large in the central part of the honeycomb filter or in the central part of the honeycomb segment, and small in the peripheral part of the filter or the segment, so that the heat capacity of the central part of the honeycomb filter is larger than that of the peripheral part. [0018]
  • As an area of the honeycomb segment positioned in the central part, a sectional area of the central part of the honeycomb segment is set to preferably 40 to 90% of that of the whole honeycomb segment in the section of the honeycomb filter perpendicular to the axial direction. [0019]
  • Moreover, a material for the honeycomb filter preferably contains one selected from the group consisting of SiC, Si[0020] 3N4, alumina, mullite, aluminum titanate, zirconium phosphate, and lithium aluminum silicate as a main crystal phase, and especially SiC is preferable because its heat resistance is superior. The sectional shape of the through-holes of the honeycomb filter is preferably any of a triangle, a tetragon, a hexagon and a corrugated shape from the standpoint of production.
  • Furthermore, the honeycomb segment preferably carries a catalyst because the filter not only traps the particulate matter but also has a function of purifying the exhaust gas or the like is provided, and the catalyst further preferably contains at least one of Pt, Pd, Rh, K, Li, and Na.[0021]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is an explanatory view showing an end face of an embodiment of a honeycomb filter of the present invention. [0022]
  • FIG. 2 is an explanatory view showing an end face of another embodiment of a honeycomb filter of the present invention. [0023]
  • FIG. 3 is an explanatory view showing an end face of another embodiment of a honeycomb filter of the present invention. [0024]
  • FIG. 4 is an explanatory sectional view showing another embodiment of a honeycomb filter of the present invention. [0025]
  • FIG. 5 is an explanatory sectional view showing another embodiment of a honeycomb filter of the present invention. [0026]
  • FIG. 6 is an explanatory partially sectional view showing another embodiment of a honeycomb filter of the present invention. [0027]
  • FIG. 7 is an explanatory sectional view showing another embodiment of a honeycomb filter of the present invention. [0028]
  • FIGS. [0029] 8 are explanatory sectional views showing other embodiments of a honeycomb filter of the present invention, FIG. 8(a) shows a case where only a central part of a honeycomb segment has a thick partition wall, and FIG. 8(b) shows a case where the partition wall of the honeycomb segment is formed in a thick cross shape;
  • FIG. 9 is an explanatory sectional view showing another embodiment of a honeycomb filter of the present invention. [0030]
  • FIG. 10 is a graph showing temperature distribution on a honeycomb filter in regeneration.[0031]
    • BEST MODE FOR CARRYING OUT THE INVENTION
  • In a honeycomb filter of the present invention, a section of the filter perpendicular to the axial direction is formed in such a manner that a heat capacity of a central part of the honeycomb filter is higher than that of a peripheral part or that a heat capacity of a central part of a honeycomb segment is higher than that of a peripheral part of the honeycomb segment. Accordingly, during use, especially at a regeneration time, a temperature rise in the central part whose temperature tends to rise more easily than in the peripheral part is suppressed, and a temperature difference between the central part and the peripheral part can be reduced. Therefore, cracks can be inhibited from being generated even by thermal stress caused in the honeycomb filter, and the filter is remarkably superior in durability. [0032]
  • The present invention will be described hereinafter in more detail based on embodiments. However, the present invention is not limited to these embodiments. [0033]
  • The present invention is a honeycomb filter for trapping particulate matter contained in a dust-containing fluid. The filter has a number of through-holes surrounded by partition walls and extending in an axial direction, the partition walls of the through-holes have filterability, predetermined through-holes are plugged at one end portion, and the remaining through-holes are plugged at the other end portion. [0034]
  • As a concrete method for setting the heat capacity of a central part of the honeycomb filter of the present invention constituted as described above or a central part of a honeycomb segment to be higher than that of a peripheral part, there are the following various embodiments. That is: [0035]
  • (1) a non-plugged through-hole end portion is plugged in the central part of the honeycomb filter or in the central part of the honeycomb segment in the end face of the honeycomb filter in the axial direction; [0036]
  • (2) a thickness of a partition wall in the central part of the honeycomb filter or in the central part of the honeycomb segment in the section perpendicular to the axial direction is set to be larger than that of the partition wall in the peripheral part; [0037]
  • (3) the thickness of the partition wall in the central part of the honeycomb segment is set to be 1.02 to 1.5 times that of the partition wall in the peripheral part of the honeycomb segment in the section of the honeycomb filter perpendicular to the axial direction; [0038]
  • (4) the thickness of the partition wall is gradually reduced toward the peripheral part from the central part with respect to some or all of the partition walls of the honeycomb segment in the section of the honeycomb filter perpendicular to the axial direction; [0039]
  • (5) a cell density in the central part of the honeycomb filter or in the central part of the honeycomb segment in the section perpendicular to the axial direction is set to be larger than that in the peripheral part of the filter or the segment; [0040]
  • (6) a bonding material of the honeycomb segment positioned in the central part of the honeycomb filter in the section perpendicular to the axial direction is set to be thicker than that of the honeycomb segment positioned in the peripheral part; [0041]
  • (7) a thermal conductivity of the honeycomb segment positioned in the central part of the honeycomb filter in the section perpendicular to the axial direction is set to be higher than that of the honeycomb segment positioned in the peripheral part; and [0042]
  • (8) the plugging is performed in the honeycomb filter such that a plugging depth is large in the central part of the honeycomb filter or in the central part of the honeycomb segment, and small in the peripheral part of the filter or the segment, so that the heat capacity of the central part of the honeycomb filter is larger than that of the peripheral part. [0043]
  • The above-described embodiments will be concretely described hereinafter. [0044]
  • First, an embodiment of setting the heat capacity of the central part to be larger than that of the peripheral part in the honeycomb filter of the present invention can be largely classified into two. First, the honeycomb filter is constituted by a single body. Secondly, the honeycomb filter comprises a plurality of honeycomb segments, and the respective honeycomb segments are bonded via a bonding material to constitute the honeycomb filter. [0045]
  • When the honeycomb filter is constituted by a single body, as the first embodiment, the end portions of the through-holes which are not usually plugged are plugged in the central part of the end face of the honeycomb filter in the axial direction. [0046]
  • As shown in FIG. 1, in a [0047] central part 11 in the end face of a honeycomb filter 10 in the axial direction, the end portions of through-holes 12 are usually alternately plugged. However, in this case, the end portions of the through-holes 12 which are not usually plugged are further plugged. Accordingly, the heat capacity of the central part 11 can be set to be larger than that of a peripheral part 13.
  • Moreover, the object to set the heat capacity of the [0048] central part 11 to be larger than that of the peripheral part 13 can be achieved also when a plugging depth is increased in the central part 11 among the plugged end portions of the through-holes 12.
  • In the above-described constitution, since an amount of soot deposited in the [0049] central part 11 becomes smaller than that in the peripheral part, there is a merit that a temperature rise at a filter regeneration time (soot burning time) can be suppressed.
  • Here, defining that a certain region extending inwardly from an outer peripheral contour of the honeycomb filter (or the honeycomb segment) is the outer peripheral part, and a remaining region (further inner region) is the central part, an area range of the central part is set to 20 to 90% of that of a sectional area of the honeycomb filter (or the honeycomb segment). Examples of the region of the central part include a region surrounded by a shape analogous to a sectional shape of an outer peripheral surface centering on a center point on the section of the honeycomb filter (or the honeycomb segment), and a region surrounded by a circle centering on the center point. The area range of the central part is preferably 40 to 90%, further preferably 50 to 90% of the sectional area of the honeycomb filter (or the honeycomb segment). [0050]
  • As the second embodiment, for example, the thickness of the partition wall in the central part of the section of the honeycomb filter perpendicular to the axial direction is set to be larger than that of the partition wall in the peripheral part. [0051]
  • As shown in FIG. 2, in the section of the [0052] honeycomb filter 10 perpendicular to the axial direction, the thickness of a partition wall 14 a in the central part 11 is formed to be larger than that of a partition wall 14 b in the peripheral part 13. Accordingly, the heat capacity of the central part 11 can be set to be higher than that of the peripheral part 13. Furthermore, in this constitution, resistance at a time when the exhaust gas passes through the partition wall in the central part of the honeycomb filter increases as compared with that in the peripheral part. Therefore, the amount of exhaust gas flowing through the central part of the honeycomb filter drops, and an amount of deposited particulate matter is also decreased. Therefore, the amount of heat generated in the central part of the honeycomb filter at the regeneration time relatively drops as compared with the outer peripheral part, temperature distribution of the honeycomb filter in a sectional direction is uniformalized, and a problem that the honeycomb filter is cracked at the regeneration time is solved.
  • In addition, as the third embodiment, as shown in FIG. 3, also when a cell density of the [0053] central part 11 is set to be larger than that of the peripheral part 13 in the section of the honeycomb filter 10 perpendicular to the axial direction, the heat capacity of the central part 11 can be set to be larger than that of the peripheral part 13 in the same manner as described above.
  • Next, the case where the honeycomb filter comprises a plurality of honeycomb segments and the respective honeycomb segments are bonded by the bonding material to constitute the honeycomb filter will be described. [0054]
  • In this manner, also when the plurality of honeycomb segments are bonded by the bonding material to constitute the honeycomb filter, the heat capacity of the filter central part can be set to be larger than that of the peripheral part by various embodiments as described below. Similarly, the heat capacity of the central part of each honeycomb segment can be set to be larger than that of the peripheral part. [0055]
  • First, as shown in FIG. 4, [0056] honeycomb segments 15 are bonded to one another by a bonding material 20 only in the central part of the honeycomb filter 10.
  • Moreover, as shown in FIG. 5, the thickness of the partition wall of a [0057] honeycomb segment 15 a positioned in the central part 11 is set to be larger than that of the partition wall of a honeycomb segment 15 b positioned in the peripheral part 13 in section of the honeycomb filter 10 perpendicular to the axial direction. In this constitution, in the same manner as in the case where the partition wall in the central part of the honeycomb filter is thickened, the amount of deposited particulate matter can be decreased. Therefore, the amount of heat generated in the central part of the honeycomb segment at the regeneration time relatively drops as compared with the outer peripheral part, and a problem that the honeycomb segment is cracked at the regeneration time is solved.
  • Furthermore, as shown in FIG. 6, in the section of the honeycomb filter perpendicular to the axial direction, a [0058] bonding material 20 a for use in bonding the honeycomb segment 15 a positioned in the central part 11 is formed to be thicker than a bonding material 20 b for use in bonding the honeycomb segment 15 b positioned in the peripheral part 13.
  • Additionally, in the section of the honeycomb filter perpendicular to the axial direction, the thermal conductivity of the honeycomb segment positioned in the central part is set to be larger than that of the honeycomb segment positioned in the peripheral part in a preferable embodiment. [0059]
  • Furthermore, in both the honeycomb filter integrally constituted by a single body and the honeycomb filter comprising a plurality of honeycomb segments, as shown in FIG. 7, plugging [0060] portions 16 are formed such that the plugging depth is large in the central part and small in the peripheral part. Accordingly, the heat capacity of the central part of the honeycomb filter 10 becomes larger than that of the peripheral part. This may be said to be a preferable embodiment. In each honeycomb segment, the heat capacity of the central part is set to be larger than that of the peripheral part as another preferable embodiment.
  • Additionally, when the honeycomb filter comprises a plurality of honeycomb segments, as shown in FIG. 8([0061] a), partition walls 14 c in the central part of the honeycomb segment 15 is formed to be thicker than partition walls 14 d in the peripheral part as another preferable embodiment. As shown in FIG. 8(b), partition walls 14 e are formed to be thick in a cross form in each honeycomb segment 15 as still another preferable embodiment.
  • The thickness of the partition wall in the central part of the honeycomb segment is preferably 1.02 to 1.5 times that of the partition wall in the peripheral part of the honeycomb segment. When the wall is thick 1.5 times, a air flow resistance of the whole honeycomb filter tends to increase. [0062]
  • Moreover, as shown in FIG. 9, in some or all of [0063] partition walls 17 in the section of the honeycomb segment 15, the thickness may be gradually increased toward the inside from a position of a contact 30 of an outer peripheral wall 18. Furthermore, the thickness of the partition wall 17 partitioning each through-hole 12 may be successively increased toward the inside from the outside. Here, “being gradually increased” means that an average thickness of the partition wall 17 which partitions the through-hole 12 positioned in a peripheral side is increased. For example, the thickness may be continuously changed as shown in FIG. 9, or the thickness may also be changed for each partition wall 17 which partitions one through-hole 12.
  • The thickness of the partition wall of the honeycomb segment is in a range of preferably 50 to 2,000 μm. When the thickness of the partition wall is less than 50 μm, strength of the honeycomb segment becomes insufficient. When the thickness exceeds 2000 μm, effective geometric surface area (GSA) of the honeycomb segment drops, and a pressure loss increases when the gas flows. [0064]
  • In the present invention, the sectional area of the central part of the honeycomb segment is preferably 40 to 90%, further preferably 50 to 90% of that of the whole honeycomb segment in the section of the honeycomb filter perpendicular to the axial direction. [0065]
  • A sectional shape of the section of the honeycomb filter perpendicular to the through-hole in the present invention may be various shapes such as a circle, an ellipse, and a lace track shape. [0066]
  • Moreover, in the honeycomb filter of the present invention, as described above, an embodiment in which two or more honeycomb segments are combined/constituted may be employed. A material for the filter preferably contains one selected from the group consisting of SiC, Si[0067] 3N4, alumina, mullite, aluminum titanate, zirconium phosphate, and lithium aluminum silicate as a main crystal phase from standpoints of strength, thermal resistance or the like, and SiC having a high thermal conductivity is especially preferable in that heat is easily discharged.
  • The cell density of cells formed by the partition walls is preferably 6 to 2000 cells/square inch (0.9 to 311 cells/cm[0068] 2), further preferably 50 to 400 cells/square inch (7.8 to 62 cells/cm2). When the cell density is less than 6 cells/square inch (0.9 cells/cm2), the strength and effective geometric surface area (GSA) of the honeycomb segment become insufficient. When the density exceeds 2000 cells/square inch (311 cells/cm2), the pressure loss increases when the gas flows.
  • There is no particular restriction as to the sectional shape of through-holes (cell shape). However, the sectional shape is preferably any of a triangle, a tetragon, a hexagon and a corrugated shape from the standpoint of production. [0069]
  • Moreover, as the bonding material for bonding the honeycomb segments and as the plugging material, a ceramic fiber, ceramic powder, or cement having heat resistance is preferably used alone, or they are mixed for use. Furthermore, if necessary, an organic binder, an inorganic binder or the like may also be mixed and used. [0070]
  • When a dust-containing fluid is passed from one end face of the honeycomb filter of the present invention, the dust-containing fluid flows into the honeycomb filter via the through-holes whose end portions on one end face side are not plugged. The fluid passes through porous partition walls having filterability, and enters the other through-holes that are not plugged on the side of the other end face of the honeycomb filter. The particulate matter in the dust-containing fluid is trapped by the partition walls when the fluid passes through the partition walls, and the purified fluid from which the particulate matter has been removed is discharged from the other end face of the honeycomb filter. [0071]
  • It is to be noted that when the trapped particulate matter is deposited on the partition wall, clogging occurs, and the function of the filter is deteriorated. Therefore, by periodically heated the honeycomb filter by a heating means such as a heater, the particulate matter is burnt/removed, and the filter function is regenerated. To promote the burning of the particulate matter at the regeneration time, a metal having catalytic activity may be loaded on the honeycomb filter. [0072]
  • It is preferred that the honeycomb filter of the present invention is loaded with a catalyst, for example, a metal having a catalytic activity when the present honeycomb filter is intended to use as a catalyst carrier for purifying exhaust gas emitted from a heat engine such as internal combustion engine or the like or from a burner such as boiler or the like, or for reforming liquid fuel or gaseous fuel. As a representative metal having a catalytic activity, Pt, Pd, Rh, K, Li and Na are mentioned, and it is preferred to load at least one kind of these on the honeycomb filter. [0073]
  • Next, methods of producing the honeycomb filter of the present invention will be described, but the method of producing the honeycomb filter of the present invention is not limited to these methods. [0074]
  • As a raw material powder for the honeycomb segment, the above-described preferable materials such as a silicon carbide powder are used. To the powder, binders such as methyl cellulose and hydroxypropoxyl methylcellulose are added. Further, a surface-active agent and water are added to prepare clay having plasticity. The clay is extruded to form honeycomb segments as shown, for example, in FIGS. 4, 5, [0075] 8(a), 8(b), and 9.
  • After drying the honeycomb segments, for example, with microwaves and hot air, the outer peripheral surface of the honeycomb segment is coated with the bonding material having the same composition as that of the clay, and the honeycomb segments are bonded, assembled, and dried. The obtained assembled dry body is heated/degreased, for example, in a nitrogen atmosphere, and subsequently heated in an inert atmosphere such as Ar atmosphere so that the honeycomb filter of the present invention can be obtained. [0076]
  • In the present invention, as a method of bonding the honeycomb segments, in addition to the method of directly applying the outer peripheral surface with the bonding material as described above, a plate formed by a bonding material in a predetermined thickness may be used, and a honeycomb segment may be bonded to another honeycomb segment by the plate and the bonding material. [0077]
  • After producing the honeycomb filter in the above-described method, the end face of the honeycomb filter can be plugged with a raw material similar to that of the honeycomb segment. [0078]
  • Catalyst may be loaded on the thus-produced honeycomb filter by a method ordinarily used by those skilled in the art, for example, by wash-coating a catalyst slurry on the honeycomb filter, and then conducting drying and firing. [0079]
    • EXAMPLES
  • The present invention is described in more detail below by way of Examples. However, the present invention is not restricted to these Examples. [0080]
  • (Examples 1 to 8, Comparative Examples 1 to 4) [0081]
  • Regeneration limit was evaluated using a honeycomb filter having material characteristics such as a porosity of 45%, an average pore diameter of 10 μm, and a thermal conductivity of 40 W/mK and comprising a honeycomb structure of SiC having a diameter of 5.66 inches and a length of 6 inches and having a plugging depth of 3 mm. In the evaluation of the regeneration limit, a predetermined amount of artificially produced soot was deposited on the honeycomb filter, and a high-temperature gas was introduced at 600° C., 2.3 Nm[0082] 3/min to regenerate the filter (burn the soot). Thereafter, a limit soot amount in which any crack was not generated was set to a regeneration limit. It is to be noted that a dimension of nine segments in Examples 4 to 7, Comparative Examples 2, 4 was basically 58 mm, and an outer peripheral segment was worked in a predetermined outer dimension in accordance with a product outer shape.
  • The results are shown in Table 1. [0083]
  • Moreover, in the honeycomb filter described in Example 1, the amount of deposited soot was 10 g/L, and a high-temperature gas having an O[0084] 2 concentration of 10% was introduced at 600° C., 0.7 Nm3/min to regenerate/burn the honeycomb filter. The results of measurement of a temperature distribution at the regeneration time in this case are shown in FIG. 10. In FIG. 10, r(m) denotes a length in a radial direction, X(m) denotes a length in an axial direction, lines shown in a graph are isothermal lines indicating a temperature distribution, and numeric values indicate temperatures of the isothermal lines (unit:° C.).
    TABLE 1
    SiC material Regen-
    Example, Cell eration
    Comparative structure limit
    Example mil/cpi Additional structure (g/L)
    Example 1 12/200 Central part additional 18
    plugged 100 cells
    Example 2 12/200 Wall thickness of central part 20
    15 mil, radial direction 50%
    length region
    Example 3 12/200 Central part 350 cpi, radial 18
    direction 50% length region
    Example 4 12/200 9 segments, bonding thickness 20
    3 mm, segment central part in
    cross form, 7 cells added in
    width, 15/200 structure, cell
    thickness increase
    Example 5 12/200 9 segments, central segments 20
    14/200, bonding thickness 3 mm
    Example 6 12/200 9 segments, central segment 18
    peripheral bonding thickness 5 mm,
    another bonded portion 1 mm
    Example 7 12/200 9 segments, central part 16
    segment thermal conductivity
    1.5 times, bonding thickness 1 mm
    Example 8 12/200 Central part plugging depth 30 mm, 18
    peripheral part 3 mm,
    depth distribution
    proportional to distance from
    center
    Comparative
    12/200 Plugging depth 3 mm 12
    Example 1
    Comparative 12/200 9 segments, uniform bonding 10
    Example 2 thickness 1 mm
    Comparative
    15/200 Plugging depth 3 mm 12
    Example 3
    Comparative 14/200 9 segments, uniform bonding  8
    Example 4 thickness 3 mm
  • (Examples 9 to 16, Comparative Examples 5 to 8) [0085]
  • The regeneration limit was evaluated with respect to honeycomb filters which were the same as those of Examples 1 to 8 and Comparative Examples 1 to 4 except for different cell structures. The results are shown in Table 2. [0086]
    TABLE 2
    SiC material Regen-
    Example, Cell eration
    Comparative structure limit
    Example mil/cpi Additional structure (g/L)
    Example 9 12/300 Central part additional 20
    plugged 150 cells
    Example 10 12/300 Wall thickness of central part 22
    15 mil, radial direction 50%
    length region
    Example 11 12/300 Central part 350 cpi, radial 16
    direction 50% length region
    Example 12 12/300 9 segments, bonding thickness 20
    3 mm, segment central part in
    cross shape, 7 cells in width,
    15/200 structure, cell
    thickness increase
    Example 13 12/300 9 segments, central segment 18
    14/200, bonding thickness 3 mm
    Example 14 12/300 9 segments, central segment 16
    peripheral bonding thickness 5 mm,
    other bonded portion 1 mm
    Example 15 12/300 9 segments, central part 18
    segment thermal conductivity
    1.5 times, bonding thickness 1 mm
    Example 16 12/300 Central part plugging depth 30 mm, 20
    peripheral part 3 mm,
    depth distribution
    proportional to distance from
    center
    Comparative
    12/300 Plugging depth 3 mm 12
    Example 5
    Comparative 12/300 9 segments, uniform bonding 12
    Example 6 thickness 1 mm
    Comparative
    15/300 Plugging depth 3 mm 10
    Example 7
    Comparative 14/300 9 segments, uniform bonding 10
    Example 8 thickness 3 mm
  • (Examples 17 to 18, Comparative Examples 10 to 11) [0087]
  • The regeneration limit was evaluated with respect to honeycomb filters which were the same as those of Examples 1 to 8, Comparative Examples 1 to 4 except that cordierite was used as the material, cell structures with 12 mil/200 cpi, 12 mil/300 cpi were used, and the cell thickness of the honeycomb segment central part was increased to 15 mil. The results are shown in Table 3. [0088]
  • (Examples 19 to 25, Comparative Examples 12 to 13) [0089]
  • SiC was used as a material, 12 mil/200 cpi, 12 mil/300 cpi were used as a cell structure, the cell thickness was increased in a predetermined area portion in the central part of a honeycomb segment as shown in FIG. 8([0090] a), and regeneration limits of Examples 19 to 25 were evaluated. The results of the evaluation of a uniform thickness are shown in Comparative Examples 12, 13.
    TABLE 3
    Cordierite &
    SiC material
    Example, Cell Regeneration
    Comparative structure limit
    Example mil/cpi Additional structure (g/L)
    Example 17 12/200 9 segments, uniform bonding 16
    thickness 1 mm, segment central
    part 5 cell square 15/200
    Example 18 12/300 9 segments, uniform bonding 16
    thickness 1 mm, segment central
    part 5 cell square 15/300
    Comparative 12/200 9 segments, uniform bonding  8
    Example 10 thickness 1 mm
    Comparative 12/300 9 segments, uniform bonding 10
    Example 11 thickness 1 mm
    Example 19 12/300 9 segments, uniform bonding 20
    thickness 1 mm, central part
    wall thickness 2% increase,
    central part area 90%
    Example 20 12/300 9 segments, uniform bonding 22
    thickness 1 mm, central part
    wall thickness 5% increase,
    central part area 90%
    Example 21 12/300 9 segments, uniform bonding 20
    thickness 1 mm, central part
    wall thickness 5% increase,
    central part area 80%
    Example 22 12/300 9 segments, uniform bonding 18
    thickness 1 mm, central part
    wall thickness 50% increase,
    central part area 70%
    Example 23 12/300 9 segments, uniform bonding 18
    thickness 1 mm, central part
    wall thickness 2% increase,
    central part area 70%
    Example 24 15/200 9 segments, uniform bonding 20
    thickness 1 mm, central part
    wall thickness 2% increase,
    central part area 90%
    Example 25 15/200 9 segments, uniform bonding 20
    thickness 1 mm, central part
    wall thickness 5% increase,
    central part area 80%
    Comparative 12/300 9 segments, uniform bonding 12
    Example 12 thickness 1 mm
    Comparative 15/200 9 segments, uniform bonding 12
    Example 13 thickness 1 mm
  • Industrial Applicability [0091]
  • As described above, according to a honeycomb filter of the present invention, during use, especially at a regeneration time, a temperature rise is suppressed in a central part of the honeycomb filter or a central part of each honeycomb segment whose temperature tends to rise as compared with a peripheral part. A temperature difference between the central part and the peripheral part of honeycomb filter or between the central part and the peripheral part of each honeycomb segment is reduced, and a thermal stress generated in the honeycomb filter can be reduced. As a result, any crack can be inhibited from being generated in the honeycomb filter, and the filter has a superior effect that durability is remarkably superior. [0092]

Claims (18)

1-17. cancelled.
18. A honeycomb filter for trapping particulate matter contained in dust-containing fluid,
the filter comprising a number of through-holes surrounded by partition walls and extending in an axial direction,
the partition walls having filterability, predetermined through-hales being plugged at one end, remaining through-holes being plugged at the other end,
wherein in a section of the honeycomb filter perpendicular to the axial direction, heat capacity in a central part of the honeycomb filter is higher than that in a peripheral part of the honeycomb filter.
19. The honeycomb filter according to claim 18, wherein in an end face of the honeycomb filter in the axial direction, a non-plugged through-hole end portion is plugged in the central part of the honeycomb filter.
20. The honeycomb filter according to claim 18, wherein in the section of the honeycomb filter perpendicular to the axial direction, a thickness of the partition wall in the central part is set to be larger than that of the partition wall in the peripheral part.
21. The honeycomb filter according to claim 18, wherein in the section of the honeycomb filter perpendicular to the axial direction, a cell density in the central part is set to be larger than that in the peripheral part.
22. The honeycomb filter according to claim 18, wherein the plugging is performed in the honeycomb filter such that a plugging depth is large in the central part, and small in the peripheral part, so that a heat capacity in the central part of the honeycomb filter is set to be larger than that in the peripheral part.
23. A honeycomb filter for trapping particulate matter contained in dust-containing fluid,
the filter comprising a number of through-holes surrounded by partition walls and extending in an axial direction,
the partition walls having filterability,
predetermined through-hales being plugged at one end, remaining through-holes being plugged at the other end,
wherein the honeycomb filter comprises an assembly of a plurality of honeycomb segments, and
in a section of each honeycomb segment perpendicular to the axial direction, a heat capacity of a central part of the honeycomb filter is higher than that of a peripheral part of the honeycomb filter.
24. The honeycomb filter according to claim 23, wherein the honeycomb filter comprises a plurality of the honeycomb segments bonded by a bonding material, and
in a section of the honeycomb filter perpendicular to the axial direction, a thickness of the partition wall of the honeycomb segment positioned in a central part of the honeycomb filter is set to be larger than that of the partition wall of the honeycomb segment positioned in a peripheral part.
25. The honeycomb filter according to claim 24, wherein the thickness of the partition wall in the central part of the honeycomb segment is set to 1.02 to 1.5 times that of the partition wall in the peripheral part of the honeycomb segment.
26. The honeycomb filter according to claim 23, wherein in the section of the honeycomb filter perpendicular to the axial direction, a sectional area of the central part of the honeycomb segment is set to 90% or less of that of the whole honeycomb segment.
27. The honeycomb filter according to claim 24, wherein in the section of the honeycomb filter perpendicular to the axial direction, the thickness of the partition wall is gradually reduced toward the peripheral part from the central part with respect to some or all of the partition walls of the honeycomb segment.
28. The honeycomb filter according to claim 23, wherein the honeycomb filter comprises a plurality of the honeycomb segments bonded by a bonding material, and
in the section of the honeycomb filter perpendicular to the axial direction, the bonding material of the honeycomb segment positioned in a central part of the honeycomb filter is formed to be thicker than that of the honeycomb segment positioned in a peripheral part.
29. The honeycomb filter according to claim 23, wherein the honeycomb filter comprises a plurality of the honeycomb segments bonded by a bonding material, and
in the peripheral part in the section of the honeycomb filter perpendicular to the axial direction, a thermal conductivity of the honeycomb segment positioned in the central part of the honeycomb filter is higher than that of the honeycomb segment positioned.
30. The honeycomb filter according to claim 23, wherein the plugging is performed in the honeycomb segment constituting the honeycomb filter such that a plugging depth is large in the central part of the honeycomb segment, and small in the peripheral part, so that a heat capacity of the central part of the honeycomb filter is set to be larger than that of the peripheral part.
31. The honeycomb filter according to claim 18, wherein a material of the filter contains one selected from the group consisting of SiC, Si3N4, alumina, mullite, aluminum titanate, zirconium phosphate, and lithium aluminum silicate as a main crystal phase.
32. The honeycomb filter according to claim 18, wherein a sectional shape of the through-hole is any of a triangle, a tetragon, a hexagon and a corrugated shape.
33. The honeycomb filter according to claim 23, wherein the honeycomb segment carries a catalyst.
34. The honeycomb filter according to claim 33, wherein the catalyst contains at least one selected from the group consisting of Pt, Pd, Rh, K, Li, and Na.
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